H∞ control for magnetic suspension system of gantry-moving type numerically controlled machine tool crossbeam

In this paper, the magnetic suspension technology is used in the gantry-moving type numerically controlled machine tool to solve the friction problem of the gantry-moving type numerically controlled machine center. Because the suspension control system of in the gantry-moving type numerically controlled machine tool is a very low stiffness of the nonlinear system, and which is constantly influenced from the external disturbance and the perturbation of the parameters itself in the process, which seriously affects the precision of the system precision. In this regard, the paper uses the robust control design H^, controller that can improve the stiffness of the suspension system. Simulation results show that this control scheme has better stability and robustness, and meets the high stiffness of the magnetic processing system performance requirements.